Investigation Of Thrahertz Radiation Drived By Multiple Electron Beams Interaction Within Hole Array Structure

Terahertz(THz) generally refers to the electromagnetic radiation with the frequency range of 100 GHz to 10 THz and the wavelength range of 3mm to 30μm.The frequency spectrum of Terahertz waves is between microwaves and infrared light,which is a very special place and has strong demand of THz application such as medicine,biology and communication. superior academic value and unique characteristics. Terahertz source as the core part of terahertz science and technology,which also is one of issue should to be resolved. while the technology of vacuum electronics is recognized as one of effective way to generate terahertz radiation.The current method of vacuum electronics technology face some problems such as low interaction efficiency and output power, difficult to manufacture. In order to solve these problems, this paper proposes a new structure, which is called multi-electron hole array periodic structure and could provide a promising way to generate high power THz radiation.The following results have been achieved in this thesis:(1) We proposed a hole periodic structure, analyzed the dispersion curve and electromagnetic characteristics, used of electromagnetic simulation software to analysis the electron-beam and electromagnetic wave interaction. In order to obtain the output power, we have designed and fabricated the T-coupling resonator structure, and studied the way to test.(2) This paper presents a multi-electron hole array structure, which can support multi-electron beam working and enhance the field intensity because of mode coupling.It shows that this structure has the EM characteristics of both surface and guiding waves.We have used of electromagnetic simulation software to analysis the electron-beam and electromagnetic wave interaction.(3) We use of single-electron hole array structure to generate Smith-Purcell radiation, first we analyzes the electromagnetic characteristics of the single-electron injection to the single-electron hole array structure, and used simulation software to analysis the electron-beam and electromagnetic wave interaction. The Smith-Purcell radiation phenomena have been observed. Finally, We used of multi-electron hole array structure to observe the Smith-Purcell radiation phenomena, and analyzed theelectromagnetic characteristics. while maintaining consistent power injection to the two different structures, we can conclusion that the more hole array structure have higher radiation electric field and conversion efficiency.